Thread filler for sewing machine



March 12, 1957 L. BONO 2,784,917

THREAD FILLER FOR SEWING MACHINE Filed Aug. 4, 1954 3 Sheets-Sheet l INVENTOR. L wr B o A/O March 12, 1957 L. BONO THREAD FILLER FOR SEWING MACHINE 3 Shets-Sheet 2 Filed Aug. 4, 1954 INVENTOR. l/ 7 E 0 11/0 BY %M, y/Zm} March 12, 1957 BQNO 2,784,917

THREAD FILLER FOR SEWING MACHINE Filed Aug. 4, .1954 3 Sheets-Sheet 3 United States Patent THREAD FILLER FOR SEWING MACHINE Luigi Bono, Pavia, Italy, assignor to Vittorio Necchi Societa per Azioni, Pavia, Italy Application August 4, 1954, Serial No. 447,818

Claims priority, application Italy April 10, 1954 4 Claims. (Cl. 242-22) The devices adapted to fill the bobbin of the shuttle of a sewing machine with yarn are of various kinds.

The most recent types are constituted by a pulley on which a rubber ring is sprung and fixed on a spindle mounted to turn on a support that can oscillate about a pin in such a manner as to permit the'pulley to come in contact With the handwheel of the machine so as to be put in rotation by the latter.

When the bobbin fitted on the spindle is filled with thread, the pulley detaches automatically from the hand wheel because of a feeler resting upon the thread wound about the bobbin and interrupting the winding of the yarn.

In the more improved types, the pressure between the rubber ring and handwheel is spring actuated affording safety of operation even if the rubber ring is worn out.

However owing to their structure and complexity, these devices are arranged outside the frame of the machine and thereby make the appearance of the machine less attractive.

The thread filler according to the present invention obviates the aforesaid inconveniences besides affording the features required for satisfactory operation, automatic detaching when the bobbin is filled with yarn and spring action between the pulley and handwheel. It affords also the advantageous possibility of incorporating it in the frame when the machine is not in operation or when it is operated for sewing, and of placing it in a position outside the frame when yarn is to be wound on the bobbin.

The thread filler comprises essentially two pieces; one provided with a casing of suitable shape and which is hinged to the frame of the machine; the other, hinged to the former and provided with a spindle whereon there is mounted a pulley which can be put in rotation by friction with the handwheel mounted on the upper shaft. On the said spindle there is fitted the bobbin to be filled with yarn. The device is embodied in such a manner that when the bobbin is filled, the piece carrying the spindle is displaced laterally, interrupting the rotation of the pulley and, consequently, the winding of the yarn and a spring acting upon the piece provided with the casing carries the whole thread filler and brings it to the retracted position in which it is incorporated in the frame of the machine. In this accommodation the said casing assumes a position flush with the frame so as to improve the appearance of the machine. The following description with reference to the drawings will make the structure and operation of said thread filler clearer.

Fig. 1 represents a partial perspective view of the machine with its thread filler in retracted position.

Fig. 2 represents an end view of the thread filler in the position in which yarn is being wound.

Fig. 3 shows a section along section line III-III of Fig. 2.

Fig. 4 shows the thread filler in two positions: winding position in full lines and detaching position in dotted lines.

Fig. 5 shows the section along the section line VV of Fig. 4.

2,784,917 Patented Mar. 12, 1957 Fig. 7 is a section along section line VIL-VII of Fig. 6.

The sewing machine illustrated in Fig. 1 comprises the frame 1 provided with a cover 2 mounted on the base 3. The upper shaft 4 moved by a motor (:not shown in the drawing) carries at one end the handwheel 5 provided in its internal part with a groove 6 in which the drive belt 7 is located. As known the upper shaft is also connected with means not described here to the members forming the sewing stitch.

The body 8 of the threader provided with the casing 9 is hinged to the frame of the machine by means of the pin 10. The piece 11 is hinged to the body 8 by means of the pin 12. The spring 13 wound on the pin 12 has its ends respectively fixed to the body 8 and to the piece 11 with such a winding that it tends to displace the piece 11 from the position shown with full lines to the position shown with dotted lines in Fig. 4.

The feeler 14 is hinged to the piece 11 by means of the pin 15 about which there is wound the spring 16 tending to displace the feeler 14 in the direction of the arrow a. So if the bobbin 17 is fitted on the spindle 18 mounted rotatably on the piece 11, the feeler 14 is in slight contact with the sleeve 19 of the bobbin 17. As the bobbin is being filled with yarn, the feeler 14 is compelled to pivot while keeping contact with the yarn wound.

On the spindle 18 there is mounted the pulley 2 which can come into contact with the belt 7 or detach therefrom according to the position assumed by the piece 11. The piece 11, caused by the spring 13 to rotate, is held in the position of Fig. 2 by the stop 21 fixed to the casing 9. Said stop acts as an abutment for the extension 22 rigid with the feeler 14. This takes place when the bobbin is empty or filled in part.

As the yarn is wound on the bobbin the feeler 14, in contact with the yarn wound, pivots about the pin 15.

When the bobbin 17 has been filled, the extension 22 has come to a position in which it is no longer withheld by the stop 21, whence the piece 11 acted on by the spring 13, comes to assume the position shown in dotted lines in Fig. 4. Simultaneously with the disengagement of the pulley 20 from the handwheel 5, the spring 10' wound on the pin 10 pivots the body 8 in the direction of the arrow a, so that the thread filler is retracted in the machine with its casing arranged flush with the frame of said machine (Fig. 6).

The pin 23 mounted on the body 8 of the thread filler is engaged in the aperture 24 provided in the piece 11 to limit the width of displacement of said piece in respect to the body 8. If the yarn is to be wound on the spool, the body 8 of the thread filler is displaced externally from the retracted position and the piece 11 is rotated laterally until the pulley 20 is brought into contact with the belt 7.

The yarn 25 coming from the coil 26 is made to pass through the eyelet 27 rigid with the casing 9 and through the tensioner 28 fixed to the base 3 and is lifted from here again to run over the rounded border 29 of the casing 9 fixed to the bobbin 17 on which it is wound up. Hence the rotation of the handwheel 5 determines the winding of the yarn on the bobbin 17 fixed to the spindle 18. As said above, when the bobbin is filled with yarn, the pulley 20 is detached automatically from the motion of the belt 7 and the thread filler is retracted into the machine at the same time.

The spring 10' wound on the pin 10 tending to rotate the thread filler in the direction of the arrow a ensures also the contact between the belt 7 and the pulley 20.

In this way the winding of the bobbin in a position outside the machine is accomplished, so that the operator is enabled to check the regular winding of the yarn;

moreover the automatic detaching of the thread filler front the h'aridwheel and the retraction thereof into the machine is performed simultaneously with the complete filling of the spool. Hencejvheu the machine is not in operation or during the sewing work, the threader is com plefely retracted into theafiefrture provided in the frame and the casing 'of the thfeader provides a cover for said aperture so as to improve the appearance of the machine.

The form of embodiment illustrated above is only an example of how the invention can be put into practice. Of course, this is possible in a great many different ways and with application at different parts of the machine, without departing from the scope of the present invention as defined in the appended claims.

What I claim is:

l. A thread-filler for a sewing-machine, comprising a sewing machine frame, a casing the outer surface of whichiform's a part of said frame when said filler is not in operative position, a body forming an integral part of saidcasing and pivotally mounted on the frame of said sewing-machine, a piece hinged over said body for rotating about an axis substantially perpendicular to the axis of rotation of said body, a spring connected to said body and to said piece, a rotatable member on said piece, a

reel spindle coaxial with said rotatable member, said rotatable member being in frictional contact with a moving part of said sewing-machine.

2. A thread-filler for a sewing-machine comprising a sewing machine frame, a casing the outer surface of which forms a part of the frame of said sewing machine when said filler is not in operative position, a body forming an integral part of said casing and pivotally mounted on said frame, a piece hinged over said body for rotating about an axis substantially perpendicular to the axis of rotation of said body, a spring connected to said body and to said piece, a feeler pivotally mounted on said piece, a spring cooperating with said feeler, an extension rigidly attached to said feeler and cooperating with an extension rigidly attached to said body, a rota-table member on said piece, a reel spindle coaxial with said rotatable member, said rotatable member being in frictional con tact with a moving part of said sewing-machine and receiving rotary motion therefrom until a determined size of the thread-wound reel is reached.

3. A thread-filler for a sewing-machine, as set forth in claim 2, whereby as soon as a predetermined size of the thread-wound reel is reached, the piece hinged over the body of said thread-filler undergoes an angular displacement about the axis of rotation of said piece so that the rotatable member of the thread-filler is no more in contact with any moving part of the sewing-machine and immediately after the body and the piece undergo an angular displacement about the axis of rotation of said body so that the outer surface of the casing of said thread-filler returns to be a part of the frame of said sewing-machine and lever therewith.

4. A thread-filler for a sewing-machine, as set forth in claim 1, further comprising means capable of limiting the angular displacement of the piece hinged over the body of said filler with respect to said body.

References Cited in the file of this patent UNITED STATES PATENTS 174,188 Browning Feb. 29, 1876 184,937 Whitehill Nov. 28, 1876 509,062 Wells et al. Nov. 21, 1893 2,430,932 Hohmann Nov. 18, 1947 2,583,482 Greenberg Jan. 22, 1952 

